No power to fuel tank

I have a 99 chevy z 71 5.3 liter. All my fuses and relays are good and i put in a new fuel pump, but still have no power to fuel tank . When i hook scan tool to hook up under dash it tells me no connection. Please help i need my truck. Thanks

- how do you know all fuses are good?
- how do you know the pump relay is good?
- how do you know (other than what you said in the 1st post) that there is no power to the pump (perhaps you have 12v and you do not have a ground?

I would check all my ground wires. I had a 96 and ended up replacing all ground wires, and I do mean all ground wires. Even the one to the fuel pump on the frame. That fixed all my problems. i had the same symptoms except the no communication for the obdII. Also if i'm correct you will only have power to the pump for a few seconds when you turn the key on unless the truck is running. Just throwing things out there.